MCO clock problem in ST7liteS2

[moshe_e]

Posted on November 08, 2004 at 09:19

MCO clock problem in ST7liteS2

[moshe_e]

Posted on November 08, 2004 at 05:04

Hello All,

I encountered a difficulty to use the MCO function.

I set the option bytes to RC oscilator, PLL ON, PLLX8 and set the MCO bit in the MCCSR (MCCSR |= 0x02

, BUT no clock is out!!!

Please Advise.....

Thanks in advance

[wolfgang2399]

Posted on November 08, 2004 at 08:30

Hi Moshealb,

if you do define the port PA6 neither as output with push pull nor as open collector with external pullup you might get this problem.

I didn't try it but think it can be the reason.

Best regards, WoRo

[moshe_e]

Posted on November 08, 2004 at 09:19

Dear WoRo,

the advice was helpfull, but now I encountered another problem:

the board is working with the inDart connected but when I leave the Metrowerks enviroment and Power up, the MCU stop working.

the option bytes are defined as follow:

-write protection = off

-read-out protection = off

-sector 0 = 1K

-No reset in halt

-watchdog = software

-LVD = OFF (with Power up Reset device + Open collector +pullup)

(I also tried ''LVD = lowest voltage'' with no Reset device)

-RC Osc. = ON

-PLL = Enabled

-PLL X8

what could possiably be the resone for this problem?

Thanks Again....